In a past life, you two were linked, probably as teacher and student or parent and child. This person looked out for your welfare, and they took your education and your upbringing seriously. In this life, you have some of that same old dynamic between you, and you both enjoy it.
Other people might look at your relationship as being a bit strange, because there's probably a big difference between you in age or maturity or experience level, and they wonder how that can possibly work. You two know how well it works from the beginning. This person is instrumental to your development; they look out for you in this life, just as they did in a previous one, and you're grateful once again for their protection and their tutelage. All their practical life experience is offered to you for your use. This aspect bodes well for a long-term relationship, but even if this ends up just being a short-term fling, you still have a wonderfully grounding effect on each other.